\documentclass{article}\usepackage{amssymb}\pagestyle{empty}\begin{document}$ \mathcal{N} = 2$\end{document} string amplitudes and the Omega background. Issue 9 (5th May 2014) - Florakis, I.
Abstract: We review recent work [1, 2] on obtaining a realisation of the Ω‐background in terms of a special series of higher‐derivative generalised F‐terms in the effective\documentclass{article}\usepackage{amssymb}\pagestyle{empty}\begin{document}$ \mathcal{N} = 2$\end{document} supergravity action. We discuss the motivation behind the identification of these couplings, their relation to the Nekrasov partition function and connect them to a worldsheet approach towards the refined topological string.